    <nav class="main">
        <div class="search">
            <form class="bs-example bs-example-form" role="form" action="{{ asset('mobile/search') }}" method="get">
                <div class="row">
                <div class="col-lg-12">
                <div class="input-group">
                    <input type="search" value="" maxlength="60" name="search_text" id="search" placeholder="书名、作者、ISBN" class="form-control">
                    <span class="input-group-btn">
                    <button type="submit" class="btn btn-default">找书</button>
                    </span>
                </div>
                </div>
                </div>
            </form>
        </div>
    </nav>